Interpretation of magnetic domain images and electron diffraction patterns in Lorentz microscopy

Lorentz TEM (transmission electron microscopy) images and associated electron diffraction patterns of magnetic domains recorded on thin-film media under various conditions are described. Various patterns of deflected diffraction spots are observed, depending on the state of magnetization of the specimen. Black and white contrast in Foucault images is controlled by the position of the aperture and results from both the magnetization distribution in the ferromagnetic thin-film specimen and the fringing fields above and below the specimen. Also shown is the effect of overwrite currents on the domain images.<
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